CVE-2025-10838
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-23

Last updated on: 2025-10-03

Assigner: VulDB

Description
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function sub_45BB10 of the file /goform/WifiExtraSet. The manipulation of the argument wpapsk_crypto leads to buffer overflow. It is possible to initiate the attack remotely. The exploit is publicly available and might be used.
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Meta Information
Published
2025-09-23
Last Modified
2025-10-03
Generated
2026-06-16
AI Q&A
2025-09-23
EPSS Evaluated
2026-06-14
NVD
CVE-2025-10838
EUVD
EUVD-2025-30827
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
tenda ac21_firmware to 16.03.08.16 (inc)
tenda ac21 *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
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Executive Summary

CVE-2025-10838 is a buffer overflow vulnerability in the Tenda AC21 router firmware version 16.03.08.16. It occurs in the function sub_45BB10 within the /goform/WifiExtraSet endpoint when the argument 'wpapsk_crypto' is manipulated. The vulnerability arises because the product copies an input buffer to an output buffer without verifying that the input size fits, leading to a stack-based buffer overflow. This flaw can be exploited remotely by sending a specially crafted HTTP POST request, potentially causing denial of service or remote code execution. [1, 2]

Impact Analysis

This vulnerability can impact you by compromising the confidentiality, integrity, and availability of the affected Tenda AC21 router. An attacker can remotely exploit the buffer overflow to cause denial of service (DoS) or execute arbitrary code on the device. This could lead to unauthorized control over the router, disruption of network services, and potential further attacks on connected systems. The exploit is publicly available and easy to execute, with no known mitigations currently. [1, 2]

Detection Guidance

This vulnerability can be detected by monitoring for specially crafted HTTP POST requests to the endpoint /goform/WifiExtraSet that manipulate the wpapsk_crypto parameter. Network intrusion detection systems (NIDS) can be configured to alert on such suspicious POST requests. Additionally, inspecting HTTP traffic for unusual or oversized wpapsk_crypto parameter values may help identify exploitation attempts. Specific commands would depend on the tools in use, but for example, using curl to test the endpoint with crafted payloads or using tcpdump/wireshark to capture and analyze HTTP POST requests targeting /goform/WifiExtraSet could be effective. [1, 2]

Mitigation Strategies

Immediate mitigation steps include replacing the affected Tenda AC21 router firmware version 16.03.08.16 with a patched or updated version if available. Since no known countermeasures or mitigations currently exist, it is recommended to isolate the vulnerable device from untrusted networks to prevent remote exploitation. Network administrators should also monitor for exploit attempts and consider disabling remote management features if possible. Applying network-level protections such as firewall rules to block access to the /goform/WifiExtraSet endpoint can reduce exposure. [2]

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